General Description
The MAX5403/MAX5404/MAX5405 is a family of dual linear taper digital potentiometers. Each device has one 3-terminal potentiometer and one 2-terminal variable resistor (Figure 1). The MAX5403/MAX5404/MAX5405 operate from +2.7V to +5.5V single-supply voltages and use an ultra-low supply current of 0.1µA. These devices also provide glitchless switching between resistors taps as well as a convenient power-on reset (POR) that sets the wiper to the midscale position at power-up. The potentiometer consists of a fixed resistor with a wiper contact that is digitally controlled through a 3-wire serial interface and has 256-tap points. It performs the same function as a discrete potentiometer or variable resistor.

Features
♦ 10-Pin µMAX Small Footprint Package
♦ 256-Tap Positions
♦ Ultra Low 0.1µA Supply Current
♦ +2.7V to +5.5V Single-Supply Operation
♦ Low End-To-End Temperature Coefficient:
   35ppm/°C
♦ Low Ratiometric Temperature Coefficient:
   5ppm/°C
♦ Power-On Reset: Wiper Goes to Midscale
   (Position 128)
♦ Glitchless Switching Between Resistor Taps
♦ 3-Wire SPI™ -Interface Compatible
♦ 10kΩ/50kΩ/100kΩ Resistor Values

Applications
   Mechanical Potentiometer Replacement
   Low-Drift Programmable Gain Amplifier (PGA)
   Volume Control
   LCD Screen Adjustment
   Adjustable Voltage Reference
   Programmable Filters, Delays, Time Constant
   Impedance Matching